Cast Drain Replacement Questions

lkellogg

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Hi All,

The drain piping in my home was done in the early 1960's (copper horizontals and vent stacks into all cast iron under basement slab). A few years ago when I bought the home, I had to have the kitchen line cabled, and while there, I had all of the lines located, to aid with future repair/replacement.

The underground cast pipe spans about 80' in total...and I've progressively been putting together a list of tools, in preparation for a potential pipe failure (whether soon or 20 years from now)...I just want to be prepared to do most of the demo/removal work myself. Quotes for the work in my area (Iowa) were incredibly high, and demo/removal was the primary driver. It's an unfinished basement with a walkout, which I feel help enable DIY, at least for the demolition.

1. Now, my question for you all is, if someday I do the re-pipe, what is the best way to handle where the copper stack goes into the cast hub? I figure I'd completely cut out the cast hub (above the slab), and use a copper to PVC hubless coupler...keeping the full coupler above what will eventually be the repourd section of slab? It seems most logical that I would never want to have any hubless adapters buried/under the slab?

2. Additionally, would supporting the copper vent stacks need to be done permanently? My plan would be to wrap some metal strapping around the cleanout tees on the stacks, and then screw the strapping into the floor joists above. Once the cast pipe is replaced and the repour has cured, would I be safe in removing the strapping?

3. Finally, when it comes to cutting the concrete, does anybody have a good recommendation for how to do so most effectively without massive amounts of dust?

Attached is an image of the current copper stack into cast hub.
 

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When needed, replace everything that is waste and vent with NO hub domestic cast iron.







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you lost me are you just replacing the underground? my experiance is cast iron no hub and abs plastic the abs is what we used in 87 and its at least 99 percent of the plastic I see and it serves very well ... that said PVC might be better im being honest I spent my entire career on abs or cast iron but I dont know pvc may be better I dont know . I wouldnt hesitate to go plastic on any or all of your dwv system I know sylvan feels cast is better I have mixed opinion both are good. but copper dwv system I dont think is as good as either it has some advantage to space savings in tight spaces.
 
you lost me are you just replacing the underground? my experiance is cast iron no hub and abs plastic the abs is what we used in 87 and its at least 99 percent of the plastic I see and it serves very well ... that said PVC might be better im being honest I spent my entire career on abs or cast iron but I dont know pvc may be better I dont know . I wouldnt hesitate to go plastic on any or all of your dwv system I know sylvan feels cast is better I have mixed opinion both are good. but copper dwv system I dont think is as good as either it has some advantage to space savings in tight spaces.
Yes, just replacing the underground cast iron. Wondering what will be the best way to configure the (PVC or plastic) connection to my 3 various copper stacks.

For example, would you just cut right above the current cast iron hub and connect the new PVC to copper there, or should I cut up a few feet higher on the copper stack to make the eventual PVC to copper connection?
 
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